Telephone transmitter device



0st. 17, 1939. s. BRUMBERGER 2,175,293

TELEPHONE TRANSMITTER DEVICE Filed July 10, 1957 INVENTOR. Syd 17C) 4 5 firumberqcr his ATTORNEY.

Patented Oct. 17, 1939 UNITED STATES PATENT orrlce TELEPHONE TRANSMITTER DEVICE Sydney Brumberger, Brooklyn, N. Y.

ApplicationJuly 10, 1937, Serial No. 152,896

2 Claims.

My invention relates to an improvement in telephone transmitter devices.

In accordance with the inventive disclosure, an instrument of this character is constructed for the purpose of receiving tone produced vibrations which through employment of the principle of operation of a microphone are accurately reproduced in the form of current variations in an electrical circuit. The electrical variations are thereafter reconverted into sound by means of a telephone receiver instrument or the like.

The primary object of the present invention is to provide a telephone transmitter device in the form of a microphone which is readily secured in a stationary operable position in association with the body or casing of the instrument.

A further object of the invention is to provide a mouthpiece member for peripherally securing the diaphragm of the microphone in position upon the casing of the device.

The invention also includes other objects, and novel features of construction and arrangement, hereinafter more particularly referred to, with the detailed description of the same in connection with the accompanying drawing.

Referring to the drawing:

Fig. 1 is a front elevation of the preferred form of the invention showing the transmitter device mounted in position on the casing of the telephone instrument,

Fig. 2 is a side elevation of the device as illustrated in Fig. 1,

Fig. 3 is a partial rear elevation of the device as shown in Figs. 1 and 2,

Fig. 4 is a partial front elevation of the telephone casing illustrating the construction of the portion of the same in which the transmitter device is secured,

Fig. 5 is a cross section taken on line 5-5, Fig. 4,

Fig. 6 is an enlarged detail front elevation view of the transmitter instrument or microphone employed in the present inventive disclosure,

Fig. 7 is a cross section on line 'I'I, Fig. 6,

Fig. 8 is a front elevation of the closure member for the microphone,

Fig. 9 is a cross section on line 99, Fig. 8,

Fig. 10 is an enlarged detail front elevation of the mouthpiece member utilized in the present inventive disclosure, and

Fig. 11 is a cross section on line III I, Fig. 10.

With particular reference to Figs. 1 to 5 inclusive in the drawing, the casing upon which the telephone transmitter device is m u ed s e gnated at I5. This casing, which is formed in any desired shape, includes therein the required devices to constitute the same a self-contained telephone instrument including a transmitter and a receiver. nated in the drawing at I6 and the transmitter at I1. r

In the present disclosure which pertains to the transmitter H, the front wall of casing I5 which is constructed to include a receiving member for positioning the transmitter element thereon is indicated at I8. A separate mouthpiece member I9 forms means as hereinafter described for securing the transmitter element IT in position.

The detail construction of the front wall of the casing, Figs. 3, 4 and 5, provides that the same include a centrally open area designated in the drawing at 20. Said casing I5 further provides a circular recess at 2| against which the diaphragm element of the transmitter is secured. This portion of the device forms a circumferential holding surface for the diaphragm of the transmitter device. A number of radially extending slots 22 are located in the recessed diaphragm receiving portion of the casing.

The mouthpiece member I9 is constructed to include a number of extending gripping pieces 23 which in a mounted position pass through the slots 22 in the recessed holding surface 2| and are bent against the rear surface of casing wall I8 to secure the same thereon as clearly indicated in Fig. 3 in the drawing.

In the transmitter proper, Figs. 6 to 9 inclusive, the diaphragm of the microphone is designated at 24. This element of the device is adapted to fit into the circular recess 2i in the front wall of casing I5, the same being circumferentially secured between the casing and the mouthpiece member I9 when in a mounted position, Fig. 3.

Suitably connected to the vibration responsive diaphragm 24 of the microphone is a primary electrode 25 which is spaced from the diaphragm by means of an annular insulation member 26. An insulating disc of mica or other similar substance is secured against the annular insulation member 26 by the primary electrode 25. The insulating disc is designated in the drawing at 21. An open end cup 28 which is adapted to contain granular carbon particles therein as shown at 29, Fig. 3, also includes a flanged surface 30 which securely grips the disc 21 about the peripheral edge of the same.

A closure element 3| which includes a secondary electrode 32 is adapted to firmly fit, by friction between the contacting surfaces, over The receiver of the device is desigthe open end of the cup 28, the respective electrodes being spaced through reason of this construction in parallel relationship.

In the embodiment of the invention illustrated, a suitable source of electrical energy is provided by batteries or otherwise, not herein shown, which through wire 33, Fig. 3, and the casing of the device contacts the circumferentially mounted diaphragm element 24. The remaining portion of the electrical circuit is through the secondary electrode 32 and its contacting arm 33 which is suitably insulated from the body of the casing l5 by an insulating member such as designated at 34 in the drawing, Fig. 3. Wire 35 leading from this portion of the device is connected to a suitable telephone instrument of the receiving type such as illustrated in the drawing and designated at IS. The transmitter operates through the well-known principles of microphonic effect.

Inasmuch as the inventive concepts herein disclosed may be embodied in other desired forms, various modifications of the illustrated improvements constituting the invention may occur to those skilled in the art and may be made without departing from the scope and purviewof the invention as herein claimed.

I claim as my invention:

1. A telephone transmitter device comprising a microphone having a diaphragm element therewith, a casing having a circular opening defined by a circumferential recessed portion thereof including a plurality of radially extending slots, the recessed surface area on the casing forming a peripheral holding surface for the diaphragm element, and a mouthpiece member, circumferentially fitting thediaphragrn, having internally extending gripping pieces adapted to pass through the slots in the casing to a position to secure the diaphragm element of the microphone against its holding surface.

2. A telephone transmitter device comprising a microphone having a diaphragm element therewith, a casing member having an opening therein, the peripherally bounding portion of which includes a plurality of slots and forms a holding surface for the diaphragm element, and a mouthpiece member including internally extending gripping pieces adapted to pass through the slots in the casing to a position to secure the diaphragm element of the microphone against its holding surface.

SYDNEY BRUMBERGER. 

